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Investment Securities - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% | 35.00% | 35.00%
Tax Equivalent Interest Adjustment | $ 3,900,000 |  |
Other than Temporary Impairment Losses, Investments | 0 | $ 0 | $ 0
Amortized cost of securities available-for-sale | 1,098,320,000 | 1,262,761,000 |
Available-for-sale Securities, Gross Realized Gains | 1,821,000 |  |
Securities held-to-maturity, at amortized cost (fair value of $363,779 and $256,672 at December 31, 2017 and 2016, respectively) | 357,197,000 | 259,833,000 |
Federal home loan bank stock | 50,100,000 | 50,086,000 |
Federal reserve bank stock | $ 8,200,000 | 8,226,000 |
Investment Securities average remaining life | 4 years 4 months 17 days |  |
Money pledged for government and trust department deposits | $ 317,000,000 | 343,000,000 |
Money pledged to secure repurchase agreements | 215,000,000 | 569,000,000 |
Money Pledged as Collateral for FHLB Advance Borrowings | $ 25,000,000 | 25,000,000 |
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block] | 0 |  |
Percentage of amount greater than shareholder's equity | 10.00% |  |
Held-to-maturity Securities, Sold Security, Realized Gain (Loss) |  |  | $ 88,000
percent of held to securities sold paid down |  |  | 97.80%
Equity investments | $ 3,500,000 | 3,500,000 |
Securities sold at a gain [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost of securities available-for-sale | $ 444,000 | 0 |
Securities held-to-maturity, at amortized cost (fair value of $363,779 and $256,672 at December 31, 2017 and 2016, respectively) |  |  | $ 3,056,000
U.S. Government sponsored entity asset-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Asset-backed securities mortgage portfolio, maturity term | 15 years |  |
Amortized cost of securities available-for-sale | $ 852,645,000 | 991,642,000 |
Securities held-to-maturity, at amortized cost (fair value of $363,779 and $256,672 at December 31, 2017 and 2016, respectively) | 56,785,000 | $ 71,211,000 |
Residential mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost of securities available-for-sale | 455,300,000 |  |
Securities held-to-maturity, at amortized cost (fair value of $363,779 and $256,672 at December 31, 2017 and 2016, respectively) | 0 |  |
Collateralized mortgage-backed securities |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost of securities available-for-sale | 397,300,000 |  |
Securities held-to-maturity, at amortized cost (fair value of $363,779 and $256,672 at December 31, 2017 and 2016, respectively) | $ 56,800,000 |  |
Minimum | U.S. Treasury and sponsored entities callable notes |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale Securities, Debt Maturities, Term | 3 months |  |
Maximum | U.S. Treasury and sponsored entities callable notes |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale Securities, Debt Maturities, Term | 2 years 6 months |  |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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